Multivariate polynomial with symbolic values in the coefficients

General Usage
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7 
julia> using AbstractAlgebra

julia> S, (a,b,c) = PolynomialRing(QQ, ["a","b","c"]);

julia> T, (x,y) = PolynomialRing(S, ["x","y"]);

julia> p = a*x + b*x^2*y + c*x*y
b*x^2*y + c*x*y + a*x

julia> p+p
2*b*x^2*y + 2*c*x*y + 2*a*x
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